How do I fix my Panasonic phone that keeps saying “out of range”?

As you can tell from the title, it is cordless. It is a model
KX-TG2570B or Ob, I’m not sure but it looks like a 0. Every time I check the recent calls, try the intercom, or try to make a call it responds after a few seconds “out of range”, even when holding the antennae right next to each other. Bear in mind, it is quite an ancient buzz too. Thanks for your help!
P.S. If it helps, it is connected to a DSL filter, so from one outlet there is two connections, one for my computer’s DSL and another for just the plain buzz. Thanks again!
Please help, someone. It’s a opportunity for 12 points! It works now but just in case it doesn’t again, please I know the question is up and running by now.
At this point I’ll settle for a bone idle “I don’t know” answer PLEASE!!

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